4-String Banjo Chord Chart and Tabs in Whole Step Down Tuning

Gb+M7, Gb+Δ, GbM7♯5, GbM7+5, GbΔ♯5, GbΔ+5, Gb augmaj7
Notes: G♭, B♭, D, F
8,5,5,7 (3112)
8,9,10,10 (1234)